Homework Answers
Answer:
Since in the given ratio, long eared pigs, short eared pigs and medium eared pigs are mentioned , we can take the character of medium eared as one of the characters which is expressed in a heterozygous condition.
The ratio mentioned in the question is 7:4:3 i.e. 7 medium eared (parental),4 long eared and 3 short eared. It is equal to 50% medium eared ,28.57% long eared and 21.42% are short eared. The approximate ratio is 2.3:1.3:1
Two medium eared pigs are mated, let the genotypes of pigs be Ll
Then the cross would be
|
gamates |
L |
l |
|
L |
LL Long ear |
Ll Medium ear |
|
l |
Ll Medium ear |
ll Short ear |
The phenotypic ratio obtained here is 2:1:1 i.e. two medium ear, one long ear and one short ear. The genotypic ratio is 2:1:1 i.e. Ll(2):LL(1):ll(1)
The ratio is approximately equal to the ratio obtained in the experiment.
If there was complete dominance then we would have got the typical Mendelian ratio of 3:1 for the phenotypes.
The ratio obtained shows that the two alleles involved are incompletely dominant and hence when both the alleles (Ll) are present, the character expressed is the intermediate i.e. the medium ear.
If both the alleles are for long ear(LL) then the expressed character is of long ear.
And if both the allels are for short ear(ll) then the expressed character is of short ear.
But in the heterozygous condition(Ll) both the alleles show incomplete dominance and both the characters are expressed partially resulting in medium ear length.
Add Answer to:
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Multiple choice, Select one:
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b. Red is dominant to orange and yellow. Orange is recessive to
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Question 1 A)
What is the inheritance pattern of eye colour? Explain your
answer.
Multiple choice, Select one:
a. Red is incomplete dominance to yellow and the heterozygotes
have orange eyes.
b. Red is dominant to orange and yellow. Orange is recessive to
red but dominant to yellow. Yellow is recessive to both red and
orange.
c. We need more information to answer the question.
d. Red is dominant to yellow.
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Background Information for Question 1:
.
Question 1 A)
What is the inheritance pattern of eye colour? Explain your
answer.
Multiple choice, Select one:
a. Red is incomplete dominance to yellow and the heterozygotes
have orange eyes.
b. Red is dominant to orange and yellow. Orange is recessive to
red but dominant to yellow. Yellow is recessive to both red and
orange.
c. We need more information to answer the question.
d. Red is dominant to yellow.
e. Red is...
Background Information for Question 1:
.
Question 1 A)
What is the inheritance pattern of eye colour? Explain your
answer.
Multiple choice, Select one:
a. Red is incomplete dominance to yellow and the heterozygotes
have orange eyes.
b. Red is dominant to orange and yellow. Orange is recessive to
red but dominant to yellow. Yellow is recessive to both red and
orange.
c. We need more information to answer the question.
d. Red is dominant to yellow.
e. Red is...
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